Outputting Lossy Dolby Digital & Lossy DTS 5.1 audio via HDMI - Dv7-4074 Win 7 64bit ATI HD 5650

Hi Everybody
I'm trying to output lossy DD & DTS 5.1 soundtracks via HDMI to my HDTV then to my AV receiver via optical. Two channel LPCM works fine. I checked for updated drivers for both the ATI HD 5650 AV Card and Win 7; says both are current versions. I'm using the HP MediaSmart program for blu-ray/dvd playback with Windows 7 64bit. Any help would be appreciated.
Steve

Thanks for the quick reply.
I don't even have the HDMI-Passthrough option in Mediasmart--Audio. It won't give it to me.
In Win-Control Panel-Hardware & Sound It says ATI-HDMI output limited to 2 Channel only no compressed formats available.
Is there a driver/setting for Win 7 or ATI or Mediasmart to work through this issue. I know there is some small change i need
to make for this computer to be setup.
One would think that to configure this "entertainment" laptop wouldn't be so frustrating.....
I've got no problem with my connection from the HDTV to my AV Receiver. I currently have X360-viaHDMI-HDTV-viaOptical-AVReciver. The HDTV has a optical output for bitstreaming lossy multichannel audio and 2 channel lpcm. I'm only looking
for lossy multichannel sound; i know you need hdmi to the recevier for lossless multichannel lpcm/dts master etc.
Mediasmart is version is 4013727
Any additional help will always be appreciated
Steve

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Ok, so I go to Creative Device Control, and on the PCI/USB tab I've changed the sampling rate to 48khz.
It was previously at 44.kHz
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Outputting Lossy Dolby Digital & Lossy DTS 5.1 audio via HDMI - Dv7-4074 Win 7 64bit ATI HD 5650

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